Atomistic simulation of sliding of 10(1)over-bar0 tilt grain boundaries in Mg

Zhang H

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Atomistic simulation of sliding of 10(1)over-bar0 tilt grain boundaries in Mg

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A series of molecular dynamics simulations was performed to study grain boundary sliding of three types of 10 (1) over bar0 tilt grain boundaries in a magnesium bicrystal. In particular, a near Sigma 11 twin boundary, an asymmetric near Sigma 11 twin boundary, and a theta = 40.3 degrees general 10 (1) over bar0 tilt grain boundary were studied. Simulations showed that grain boundary sliding (a rigid motion of two grains relative to each other along boundary plane) did not occur over the stress range applied; instead, coupled shear motion (grain boundary sliding induced boundary migration) was dominant. Although the measured coupling coefficient, the ratio of boundary tangential displacement to boundary normal displacement, was in good agreement with theoretical prediction, the detailed shear behavior was different, depending on types of grain boundary, magnitude of applied shear stress, and temperature. It was also noted that grain boundary twining was the predominant mechanism that allowed the coupled shear motion to occur in hexagonal close-packed (HCP) magnesium.

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《Journal of Materials Research》 |2009年第11期|3446-3453|共8页
作者
Zhang H;
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作者单位

Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2V4, Canada.;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类工程材料学;
关键词
5 MACROSCOPIC PARAMETERS; NEAR-COINCIDENT CELLS; SHEAR DEFORMATION; MAGNESIUM ALLOY; EVOLUTION; METALS; ORIENTATION; MIGRATION; CRYSTALS; LATTICES;

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Atomistic simulation of sliding of 10(1)over-bar0 tilt grain boundaries in Mg

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